Removable seat for pump-valves.



No. 790,961. PATENTED MAY 80, 1905. P. HOLTZMANN. REMOVABLE SEAT FOR PUMP VALVES.

APPLIOATION FILED AUG. 29, 1904.

PHILIP HOLTZMANN,

Patented. May 30, 1905.

PATENT OFFICE.

OF N W YORK, N. Y.

REMOVABLE SEAT FOR PUMP-VALVES.

SPECIFICATION forming part of Letters Patent No. 790,961, dated May 30, 1905.

Application filed August 29, 1904. Serial No. 222,637.

gether with washers between said removable seats and the plate, and means upon the valvestem to securely unite said members. 1

The object of my improvement is to facilitate and render inexpensive the operation of refacing or dressing the seats of valve-plates,

as for hydraulic pumps. These plates are commonly fitted with a large number of valve openings and seats, and the practice is to remove the entire plate when one or more valveseats thereon are to be refaced, this operation involving considerable loss of time and expense, whereas by my invention a single worn valve-seat or a number thereof may be readily removed from the plate without dismantling the pump, and while thus removed said valve-seats may be speedily refaced, subsequently being returned, or new valve-seats may be placed in position.

In the drawings accompanying this application, Figure l is a side elevation of my improvement, the valve-plate being shown broken away. Fig. 2 is a section through the line 2 2 of Fig. 1, and Fig. 3 is a plan view taken on the line 3 3 of Fig. 2.

In said figures the letter A indicates a portion of a valve-plate which may be provided with a desired number of valves, (0 indicating the ports in said plate for a single valve. indicates a usual form of disk valve, of rubber or other suitable material, C a valvestem, and c a spring to yieldingly hold the valve to its seat. These are the usual parts comprising a valve of this character, the valve seating directly against a facing upon the plate A about the ports a. As is well known in this art, when the valve-seat thus provided becomes pitted or worn the entire plate A must be removed for the purpose of refacing said seat, and if too badly worn to be refaced then the entire plate is thereby rendered useless. In order to avoid the delay and great expense occasioned by these conditions, I have provided a removable seat for each valve, said removable seat being indicated by the letter D and being provided with ports d, registering with the ports a in plate A and securely held in position upon said plate over said ports. A washer, as E, of suitable elastic material, having ports 0, adapted to register with the ports a and cl, is placed intermediate the plate A and removable seat D for the purpose of rendering liquid-tight the union between said members.

The removable seat D consists of a disk of metal of suitable thickness and having a smooth outer surface adapted to receive the disk valve. Said seat D may be caused to register its ports with the ports in plate A by means of holes a d in said members, respectively, within which dowels, as 0 may be fitted, these means also serving to prevent lateral displacement of the seats D.

The Valve-stem C is provided with a shoulder 0 anterior to its threaded portion, the thickness of said stem corresponding with the external diameter of said shoulder, whose function it is when the stem C is screwed into plate A to bear against the outer surface of disk D, about the central orifice therein, to unite said disk securely with its washer E to the plate A.

As is obvious, in this device the threaded portion of stem C is straight, and the threaded orifice in the plate A is also straight to receive the same, this being in contradistinction to the tapered stern and plate orifice employed with the pump-valves now in use.

Having now described my invention, I declare that what I claim is 1. In a pump-valve, a valve-plate having ports and a removable valve-seat fitted there over, said valve-seat having ports registering with the ports in said plate.

2. In a pump-valve, a valve-plate having ports, a removable valve-seat for said plate, said valve-seat having corresponding ports,

and an intermediate Washer provided With apertures in alinement With said ports.

3. In a pump-valve, a removable valve-seat consisting of a metal disk having ports adapted to register With the ports in the valve-plate, a valve-stem adapted to secure said valve-seat upon the valve-plate, and a disk valve upon said stem.

4. In a pump-valve, a removable valve-seat consisting of a metal disk and a Washer therefor, said disk and Washer having ports registering With the ports in a valve-plate, a valvestem adapted to screw into the valve-plate and having an annular shoulder to secure the valve-disk and Washer to the valve-plate, and a disk valve upon said stem.

5. In a pump-valve, a removable valve-seat consisting of a metal disk and a Washer therefor having ports adapted to register With the ports in a valve-plate, dowels entered in holes in the valve-disk, Washer, and plate to register the ports in said members, a valve-stem passed through said valve-disk and Washer and screwed into the valve -Qplate, and a shoulder 

